LLC Management Company “Aluminium products”, Moscow, Russia:

S. L. Tsukrov, Chief Specialist, e-mail: tsukrov@bk.ru

This paper shows the main trends of development of coil production: expanding the range of supply conditions and growing number of small lots. These trends led to the wide use of the single-coil elevator furnaces and chamber furnaces with side-charging, increasing the production flexibility and fitting well with the high-bay storage systems. There is given the basic information about modern coil annealing furnaces with efficient atmosphere circulation and jet heating of coil sides. Furnaces have a gas-tight design and can be operated with a protected atmosphere. They are also equipped with forced cooling of coils in a protective atmosphere. The furnaces operate with automatic charging and discharging of coils in computerized process. Various coil annealing (differing by the temperature and time parameters and functions) is carried out in these furnaces. There are given the brief characteristics of recrystallization (complete) annealing, pre-recrystallization (partial) annealing, high annealing of heat treatment hardened alloys, and stabilizing annealing of magnalium alloys. Some annealing modes are shown in tables. The principles of choice of main annealing parameters are considered: range of coil heating temperature; furnace, holding and cooling rate temperature. Peculiarities of annealing in protection atmosphere are described. Annealing process is automatic, according to the program using mathematical model, coil database and technological parameters.

1. Han L., Thornton M., Shergold M. A comparison of the mechanical behaviour of self-piercing riveted and resistance spot welded aluminium sheets for the automotive industry. Materials & Design. 2010. Vol. 31, No. 3. pp. 1457–1467.
2. Yan-bo Sun, Ye-qing Zhao, Di Zhang, Cui-yun Liu, Hao-yan Diao, Chaoli Ma. Multilayered Ti-Al intermetallic sheets fabricated by cold rolling and annealing of titanium and aluminum foils. Transactions of Nonferrous Metals Society of China. 2011. Vol. 21, No. 8. pp. 1722–1727.
3. Mineral commodity summaries. Reston : U.S. Geological Survey, 2015. pp. 16–17.
4. Tzscheutschler H., Olberts P. Flexibilitaet ist trumpf. Aluminium. 2000. Vol. 76, No. 6. pp. 451–458.
5. Rieth B. Singl coil annealing – a new route to higher flexibility. Aluminium Imternational Today. 2002. pp. 15–17.
6. Teichert H., Faupel B., Wilden E. One-coil furnace for the heat treatment of aluminium strip coils. Aluminium. 2002. Vol. 78. pp. 1056–1063.
7. Deimann B., Migchilsen J., Valder G., Wilden F. Betriebserfahrungen mit der mathematischen Modellirung der Otto Junker-bandbundegluehoefen bei Alunorf. Aluminium. 2012. Vol. 4. pp. 50–53.
8. Waermetechnik: Zeitlos wichtig fuer metallurgische Prozesse. Aluminium. 2015. Vol. 5. p. 49.
9. GOST 13726–97. Lenty iz alyuminiya i alyuminievykh splavov. Tekhnicheskie usloviya (State Standard 13726–97. Aluminium and aluminium alloys strips. Specifications). Introduced: January 01, 1999. (in Russian)
10. Benedy J. C. International temper designation systems for wrought aluminum alloys. Light Metal Age. 2009. pp. 26-30.
11. Novikov I. I. Teoriya termicheskoy obrabotki metallov (Theory of thermal treatment of metals). Moscow : Metallurgiya, 1986. 480 p.
12. Kolachev B. A., Gabidulin R. M., Piguov Yu. V. Tekhnologiya termicheskoy obrabotki tsvetnykh metallov i splavov (Technology of thermal treatment of non-ferrous metals and alloys). Moscow : Metallurgiya, 1980. 279 p.
13. ASM. Handbook. Vol. 4. Heat Treating. ASM International. 2007. pp. 869–871.
14. Tsukrov S. L. Primenenie kontroliruemykh atmosfer pri otzhige alyuminievogo prokata (Application of controlled atmospheres with annealing of rolled aluminium). Moscow : All-Russia Institute of Light Alloys, 1972. 52 p.
15. Berrenberg T., Kramer C. Energieeinsparung beim Clühen von Bandbunden aus Aluminiumlegierungen durch Kraft-Wärme-Kupplung. Gas wärme International. 2008. Vol. 6. S. 418–421.